单项选择题
Compressed air is used on board ship for all the following purposes except （）.
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air
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Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.
A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves -
单项选择题
A number of biological sewage treatment plants are in use at sea but nearly all work on what is called the extended aeration processBasically the consists of oxygenating the liquor by bubbling air through itAccording to the above two sentences, the word "this" means （）.
A.a sewage treatment plant
B.the extended aeration process
C.the liquor
D.the bubbling air -
单项选择题
Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.
A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers
